I tabbed it out and found it very hard to sing and play at the same time.
So this is a simplified version.
Feel free to add the original melody in your own interpretation ;)
AmBm
This sunny Sunday
AmBm
Is a good day to go
AmBm
Guess you want me to stay
AmBm
Well then let me know
Am
And I hate to say
CBm
It's been a waste of time
AmCBm
I hate to interrupt the flow
(Chorus)
Am Am/C Am Am/C Am Am/C Am Am/C <--changes very fast, you'll figure it
Why, Why, out when you listen to the song
BmG
Why Hushabye
AmAm/CAmAAmCAm/CAmAm/CBmG
Hushabye, why aren't you ready to go?
AmAmAAAmCAmAAm/C
Why, Why,
BmG
Why Hushabye
AmAm/CAmAAmCAm/CAmAmBmG
Couldn't we fast forward all through this show?
AmBm
You say you'd love to
AmBm
But you've lots left to do
AmCBmAmBm
Almost decided to stay 'cause of you
AmCBm
And I hate to tell you to exchange your dreams.
AmCBm
For one more tick of no return
(Chorus)
ADBCBC
(Why, why
What you hanging up for?
What you doing that for? <--just play these chords until you sang all of this :D
What you beggin' up for?
Why, hushabye)
Am F D G G# 4x
I hate to interrupt the flow
For one more ticking of your time
AmBm
Soothing Sunday
AmBm
is a good day to go!
(Chorus)
AmAmAAAmCAmAAm/C
Why, Why,
BmG
Why Hushabye
AmAm/CAmAAmCAm/CAmAm/CBmG
Hushabye, why aren't you ready to go?
AmAmAAAmCAmAAm/C
Why, Why,
BmG
Why Hushabye
AmAm/CAmAAmCAm/CAmAmBmG
Couldn't we fast forward all through this show?
Am F D G G# 4x
Why, why, why I
What you breaking up for?
Why, why